Explain what makes one atom different from another ato

Answer:

Gamma rays—3 and radio waves—2

Explanation:

hard time seeing question, but i believe it is Gamma rays—3 and radio waves—2

Ferrihydrite in forest soil at pH=5 is more likely to sorb benzene than 2,4-D. At pH=4, the sorption potential of 2,4-D to ferrihydrite may be enhanced due to increased positive charge on the surface of the hydroxide.

Ferrihydrite, a type of iron oxide, has the ability to sorb organic compounds through various mechanisms such as surface complexation, hydrogen bonding, and hydrophobic interactions. Benzene, being a non-polar compound, is more likely to sorb to ferrihydrite due to hydrophobic interactions and weak van der Waals forces. On the other hand, 2,4-D, being a polar compound, may have limited sorption to ferrihydrite at pH=5 due to the dominance of repulsive interactions between the negatively charged surface of ferrihydrite and the negatively charged 2,4-D molecule.

At pH=4, the increased positive charge on the surface of ferrihydrite enhances the sorption potential of 2,4-D. The positive charge can attract and bind with the negatively charged 2,4-D molecule through electrostatic interactions. This can result in increased sorption of 2,4-D to ferrihydrite in tropical soils like Qxisol.

Conversely, at pH=9, the increased pH results in a decrease in the positive charge on the surface of ferrihydrite. This reduction in positive charge limits the sorption potential of 2,4-D as the electrostatic attraction between the hydroxide and the 2,4-D molecule decreases. This suggests that in arid soils like Aridisol, characterized by higher pH levels, the sorption potential of 2,4-D to ferrihydrite may be lower compared to humid climates.

The sorption potential of 2,4-D as a function of soil type in humid vs. arid climates can be predicted by considering the pH of the soil. Higher pH in arid soils can lead to reduced sorption of 2,4-D to hydroxides like ferrihydrite or goethite, while lower pH in humid soils can enhance the sorption potential due to increased positive charge on the hydroxide surface.

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Answer: 4.35%

Explanation:

Scientists estimate that the current composition of gases in the Earth's atmosphere has been stable for the last 200 million years or so.

If the Earth was formed 4,600 million years ago then the percentage of her age that the atmosphere has been in its composition is:

= 200 / 4,600 * 100%

= 4.35%

zooplankton cod and krill

Answer:

I hope this helps

Answer:

.........................okay?

What do you want for the answer the balance equation?

A tablet weighing 0.940 g was dissolved in dilute sulphuric acid made up to 250 cm³ with water. 25.0 cm³ of this solution was titrated with 0.00160 M K\(_2\)Cr\(_2\)O requiring 32.5 cm3 of the  K\(_2\)Cr\(_2\)O. 4.17% is the percentage by mass of  \(Fe^{2+}\) in the tablet.

Mass percent is a means to describe a component in a specific combination or to convey a concentration. The mass percentage used to describe the solution composition indicates the mass of solute contained in a given mass of solution. The solute's concentration is specified in terms of mass or moles.

6\(Fe^2+\) + \(Cr_2O_7^{2-}\) + 14\(H^+\) → 6\(Fe^{3+}\) + 2\(Cr^{3+}\)+ 7H\(_2\)O

32.5 cm³x 0.00160 M = 0.052 g of K\(_2\)Cr\(_2\)O\(_7\)

0.052 g / 294.18 g/mol = 0.000177moles of K\(_2\)Cr\(_2\)O

0.000177 mol / 6 = 0.0000295 mol moles of \(Fe^{2+}\)

0.0000295 mol / 0.025 L = 0.00118 M  of  \(Fe^{2+}\)

0.00118 M x 55.845 g/mol x 0.025 L = 0.0392 g of  \(Fe^{2+}\)

0.0392 g / 0.940 g x 100% = 4.17% percentage by mass of  \(Fe^{2+}\)

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Answer:

Molarity (M) is calculated by dividing the volume of the solution (V) in liters by the number of moles of solute (n).

Explanation:

Answer: Inverse proportionality relation

Explanation: As M = no. of moles of solute / volume of solution

Answer:

P2 = 2.25 atm

Explanation:

Given:

V1 = 1.5 L. V2 = 2.0 L

P1 = 3.0 atm. P2 = ?

Use Boyle's law and solve for P2:

P1V1 = P2V2

or

P2 = (V1/V2)P1

= (1.5 L/2.0L)(3.0 atm)

= 2.25 atm

Answer:

D) Cyanidin indicator

Explanation:

Cyanidin indicator has to be used in order to get an emerald green color at a pH of 9.

Indicators are substances that change colour when they are added to acidic or alkaline solutions.

In nature, cyanidin is a reddish-purple (magenta) pigment. It is the major pigment in berries [4] and other red-coloured vegetables such as red sweet potato and purple corn. It appears as a blue-reddish or purple pigment in the plant.

Cyanidin indicator has to be used in order to get an emerald green colour at a pH of 9.

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The most soluble compound in water among the options provided would be propanal (also known as propionaldehyde). Option B is correct.

Propanal is a polar compound that contains a carbonyl group (C=O), which allows it to form hydrogen bonds with water molecules. Hydrogen bonding between propanal and water enhances its solubility.

On the other hand, cyclobutane is a nonpolar compound composed solely of carbon and hydrogen atoms. Nonpolar compounds tend to have weaker interactions with water molecules and are typically less soluble in water compared to polar compounds.

Therefore, based on the polarity and ability to form hydrogen bonds, propanal would be expected to be the most soluble in water.

Hence, B. is the correct option.

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--The given question is incomplete, the complete question is

"Which of the following would be expected to be the most soluble in water? A) cyclobutane B) propanal C) not possible to decide."--

Answer:

The climate was very hot and became colder in later time periods.

Answer:

The climate was very hot in earlier time periods and became colder in later time periods.

The elements are categorized based on similar attributes so that it could be easier to collectively study the properties of the elements.

The periodic table is arrangement of the elements based on the atomic number of the elements. This implies that the elements are arranged in the order of increasing atomic numbers of the elements. The atomic numbers of the elements therefore tend to increase from left to right. This is how the Mendeleev table of elements was arranged.

Now, let us know that the periodic table is arranged in groups and periods. The elements in the same group have similar chemical properties while the elements in the same period only have the same number of shells or the same highest energy level.

Having said this, the elements are categorized based on similar attributes so that it could be easier to collectively study the properties of the elements.

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Answer:

The atmosphere can be divided into layers based on its temperature, as shown in the figure below. These layers are the troposphere, the stratosphere, the mesosphere and the thermosphere.

The energy is coming from the battery that is in the torchlight.

In the case of an object in motion, energy is coming from the kinetic energy of the object. Kinetic energy is the energy an object possesses due to its motion. This energy is transferred to the object by an external force, such as a push or a pull, which causes the object to start moving or to change its motion.

Energy is the ability to do work and can take many forms, such as thermal, kinetic, potential, and chemical energy. Energy can be transformed from one form to another and can also be transferred from one object to another.

Therefore, In the case of an object being put into motion, energy is coming from the potential energy of the object. Potential energy is the energy an object possesses due to its position or configuration. This energy is transferred to the object by an external force, such as gravity, which causes the object to start moving or to change its motion.

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Answer:

first identify the cation and write down its symbol and charge. Then, identify the anion and write down its symbol and charge.

Explanation:

In the DNA ,the nitrogen bases are held together in the center of the molecule by the hydrogen bond.

The nitrogen bases are held together in the center of the DNA molecule by the hydrogen bond. The hydrogen bond that is the H - bond binds the nitrogen bases in between the two strands of the DNA. There are the two hydrogen bonds that is present in between the A and the T and the three hydrogen bond in between the G and the C.

The hydrogen bond in the DNA held together the nitrogen bases in the center of the molecule.

This question is incomplete, the complete question is :

In the DNA ,the nitrogen bases are held together in the center of the molecule by ?

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The formation of solid magnesium chloride (MgCl₂) by the reaction between chlorine gas (Cl₂) and magnesium metal (Mg) at high temperatures is classified as a synthesis reaction or a combination reaction.

Synthesis reactions involve the combination of two or more substances to form a single product. In this case, chlorine gas and magnesium metal combine to produce magnesium chloride as the sole product.

The balanced chemical equation for this synthesis reaction is:

Mg + Cl₂ ⇒ MgCl₂

Hence, the reaction between chlorine gas and magnesium metal to form solid magnesium chloride indicates a synthesis reaction, as the elements combine to form a compound.

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According to kinetic theory of gases, when samples are heated from liquid to gas phase, particles move faster and spread out more. Hence, option a is correct.

According to kinetic theory of gases. Gaseous substances are made of tiny particles called molecules. The molecules within a container are in a state of random chaotic motion during which they collide with  each other.

At, a particular instant, different molecules in a sample of gas may have different velocities and hence, different kinetic energies.  The kinetic energy of molecules is directly proportional to the temperature.

Hence, the the sample  when heated, the molecules acquire higher kinetic energy and they will move apart. Therefore, option a is correct according to kinetic theory.

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The element is fluorine

The orbital configuration refers to the arrangement of electrons in an atom or molecule's orbitals, which are regions of space where electrons are most likely to be found.

Electrons occupy different orbitals depending on their energy level, which is determined by the distance from the nucleus of the atom. The lowest energy level is called the ground state, and it contains the most stable electron configuration.

The electronic configuration of an atom or molecule is usually written using a notation that indicates the energy level and the number of electrons in each orbital. For example, the electronic configuration of carbon, which has six electrons, is 1s2 2s2 2p2, where the numbers and letters refer to the energy level and orbital type, respectively.

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Answer: F (fluorine)

The first law of thermodynamics relates the heat transfer into or out of a system (Q) to the change of internal energy (ΔU) and the work done on the system (W).

The first law of thermodynamics, also known as the law of energy conservation, states that energy cannot be created or destroyed, but it can be transferred or converted from one form to another.

In the context of a thermodynamic system, which can be a physical object or a region of space, the first law states that the change in internal energy of the system (ΔU) is equal to the heat transferred into or out of the system (Q) plus the work done on or by the system (W).

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a gas sample was collected over water at 25°c. the total pressure is determined to be 0.97 atm. So the partial pressure of the gas collected is 0.9387 atm.

To find the partial pressure of the gas collected, we need to use Dalton's law of partial pressures. According to this law, the total pressure of a gas mixture is equal to the sum of the partial pressures of each gas component. In this case, the gas sample was collected over water, so we can assume that the gas is in equilibrium with the water vapor, which means that the partial pressure of water vapor is also present.
Therefore, we need to subtract the partial pressure of water vapor from the total pressure to get the partial pressure of the gas. The vapor pressure of water at 25°C is 0.0313 atm. So, the partial pressure of the gas collected would be:
Partial pressure of gas = Total pressure - Partial pressure of water vapor
Partial pressure of gas = 0.97 atm - 0.0313 atm
Partial pressure of gas = 0.9387 atm
Therefore, the partial pressure of the gas collected is 0.9387 atm.

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The perimeter of the square is 48 meter if the length of the side is 12 meter.

A square can be defined as a two-dimensional closed shape with 4 equal sides and 4 vertices. The opposite sides of the square are parallel to each other. Square is also a rectangle with equal length and breadth. The perimeter of the square is a two-dimensional shape. The perimeter the length of one side must be multiplied by 4 as squares have 4 sides. so, 12 is multiplied by 4 and the result will be 48 meters. so, the parameter of the square will be 48 meters. A square is a quadrilateral with four equal sides. There are so many objects that are in the shape of a square. The square shape is identified by its equal sides and the interior angles are equal to 90°.

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Answer:

5,000

Explanation:

When rounding to the thousands place, you look at the digit in the hundreds place, if the digit is less than 5 you round down. For example if the number was "4,456," we would round to "4,000." But, since the digit in the hundreds place is 7, which is greater than 4, you round up to "5,000."

∆Hrxn = - 392 kJ , the bond energies on the right side (products) and the left side (reactants): CH₃OH(l) + 2O₂(g) ==> CO₂(g) + 2H₂O(g)

Let's examine the bond energies on the right side (products) and the left side (reactants): CH₃OH(l) + 2O₂(g) ==> CO₂(g) + 2H₂O(g).

O=C=O is CO, and the bond energy is 2x799, or 1598 kJ/mole x 1 mol, or 1598 kJ.

H2O is H-O-H, and the bond energy is 2x464, or 928 kJ/mole x 2 moles, or 1856 kJ, or 1598 + 1856 = 3454 kJ.

CH₃OH has 3 C-H bonds, 1 C-O bond and 1 O-H bond,

bond energy = 3x414 kJ + 360 kJ + 464 kJ

                         = 2066 kJ

O₂ is O=O, bond energy = 498 kJ/mol x 2 moles = 996 kJ

Complete reactants = 2066 + 996 = 3062 kJ

∆Hrxn = ∑reactants - ∑products = 3062 - 3454

                                = - 392 kJ

(note: The negative sign indicates an exothermic reaction, in which heat is released during methanol combustion.)

The amount of energy required to convert the atoms in a molecular bond into free atoms is referred to as bond energy, and it is a measure of the bond strength of a chemical bond.

Different molecules are produced when a chemical reaction breaks molecular bonds and makes new ones. Hydrogen and oxygen, for instance, are created when the bonds between two water molecules are severed. Breaking a bond always requires energy, which is called bond energy.

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Answer:

A. two atoms of the element from the first column and one atom of the element from the sixteenth column.

Explanation:

If an ionic compound formed between an element from the first column of the periodic table and another from the sixteenth column, you would expect the compound to include two atoms of the element from the first column and one atom of the element from the sixteenth column.

The periodic table is arranged in rows and columns. The rows are periods while the columns are groups.

The first column of the periodic table contains elements that form univalent ions hence they have a valency of 1. The elements in the sixteenth column usually form divalent negative ions and have a valency of 2.

An example of an element of the first column is sodium while an example of an element of the sixteenth column is sulphur.

During ionic bond formation, there is an exchange of valency such that the formula of a compound formed between sodium and sulphur is Na2S.

Therefore, when an ionic compound formed between an element from the first column of the periodic table and another from the sixteenth column, you would expect the compound to include two atoms of the element from the first column and one atom of the element from the sixteenth column.

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Answer:

1. I hypothesize that if you continue to add more drops, then the time it takes will continue to increase.

2. A; 9.70 secs, B; 14.63 secs, C; 18.78 secs, D; 28.70 secs, E; 31.45 secs.

3. The formation continued to increased. As more was added, the time it took to reach the full reaction was increased.  

4. Yes.  

5. When the concentration of all the reactants increases, more molecules or ions interact to form new compounds, and the rate of reaction increases. When the concentration of a reactant decreases, there are fewer of that molecule or ion present, and the rate of reaction decreases.

6. 6mL.

Explanation:

Answer:

neutral [H3O+] = [OH−] pH = 7   7.2: pH and pOH

Explanation:

At pH 7, the substance or solution is at neutral and means that the concentration of H+ and OH- ion is the same.